| As a new form of urban rail transit structure, the bridge viaduct station has beenmore and more widely used in our country’s urban rail transit system. But the structuraldynamics studies haven’t formed a complete theoretical system. The effects on itsvibration characteristics by changing some certain factors remain to be discussed. Onthe basis of reviewing and summarizing the status of bridge structure vibrationresearch at home and abroad, the Elevated station on Chongqing Subway Line2ischosen as the background. Mainly take the deep research on the impact of its vibrationcharacteristics from changing rail fastener spacing and concrete strength grade. Themain research works are as follows:（1）Based on large finite element software ANSYS14.0, establishing theplatform-bridge-structure"spatial whole model. The PCG Lanczos method has beenused to analysis the modal, getting the top ten natural frequencies and the vibrationmode nephogram from the corresponding modal. Summarize the vibration shape ofeach modal, listing the detailed modal information table, finding out the main modal ofthe structure natural vibration.（2）According to the national design specification requirements, respectively setup five different structure analysis models. Take the deep research on the impact of itsvibration characteristics from changing rail fastener spacing and concrete strengthgrade. Calculate top six natural vibration frequency values and their maximal vibrationdisplacements in each direction, drawing the relational graph which expressed therelationship between vibration displacements and rail fastener spacing.（3）From the perspective of driving safety and riding comfort of the human body,fully considering the cost of building construction, discussing and analysing eachcalculation results. Through the comparison between each scheme, putting forward theoptimization of rail fastener spacing and concrete strength grade reference value.Provide the certain reference for solving this similar problem. |
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